Improvement in rock-drills



UNITED STATES PATENT OFFICE.

JULIUS C. DICKEY, OF NEW YORK, N. Y.

IMPROVEMENT IN ROCK-DRILLS.

Specification forming part of Letters Patent No. 53,586, dai ed April 3,1866.

To all whom 'it may concern Be it known that I, JULIUs C. DICKEY, of NewYork, inutile county of New York and State of New York, have invented anew and Improved Mode of Constructing Rock-Drills for Boring Oil-Wells;and I do hereby declare that the following is a full and exactdescription thereof, reference being had to the` accompanying drawings,and to the letters of reference marked thereon.

Figure l is a perspective view, Fig. 2 a longitudinal section, Fig. 3 across-section, and Fig. 4 a perspective view, of 'drill-bit B.

The drill-bits A, B, and O are incased in the cylindrical cap D, the bitB being made with shoulders E E, against which the bits A and O rest,the several bits being secured in cap D by means of the bolt F and thedrill-rod, which is screwed onto bit B above cap D.

I make bit B with a cutting-edge in its center, as shown in Figs. 2 and4, and make the outside ends of said bit with a cutting-edge, so as tocut in an opposite direction from the center ofthe bit and act as areamer.

I contemplate making the distance between the bitsA and O greater attheir outside ends than in the center of the bits, so that the drillwill work more freely should it be liable to clog between the bits.

In some cases I make the lower ends of bits A and C the form ot' thewell, or nearly so, so as to act as a reamer, in which case I make bit Bsomewhat similar to bits A and O.

I also contemplate securing these bits in a cylinder or cap made on theend of a drill-rod.

I increase the number of bits in proportion to the size of the well tobe bored. They are very readily disconnected from cap D, when necessaryto sharpen them, by unscrewing the drill-rod and removing bolt F.

The use of cap D may be dispensed with by making a hole in shoulders E Eto receive a tenon made on the ends of bits A and C, said bits A and Cbeing secured in their place by a bolt passing through said tenon, or anut screwed onto the tenon above the shoulders, or in any othersubstantial manner.

Above the drill, on the drill-rod, I contemplate securing a circularpiece of metal, about the size ot' the well, made of cast or wroughtiron, with slots in the sides of the same, for the purpose ot making thedrill work steady and perpendicular in the well.

It is manifest that the form and arrangement ot' the parts may besomewhat varied without a departure from the spirit of my invention.

What I claim as my invention, and desire to secure by Letters Patent,is-

The central drill-bit, B, made to answer the purpose ot' a reamer, incombination with the drill-bits A and O, substantially as set forth.

JULIUS C. DICKEY.

Witnesses:

M. M. LIVINGSTON, WM. TEEURN.

